30 lines
1.3 KiB
TypeScript
30 lines
1.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {global} from './global';
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export function getNativeRequestAnimationFrame() {
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let nativeRequestAnimationFrame: (callback: FrameRequestCallback) => number =
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global['requestAnimationFrame'];
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let nativeCancelAnimationFrame: (handle: number) => void = global['cancelAnimationFrame'];
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if (typeof Zone !== 'undefined' && nativeRequestAnimationFrame && nativeCancelAnimationFrame) {
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// use unpatched version of requestAnimationFrame(native delegate) if possible
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// to avoid another Change detection
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const unpatchedRequestAnimationFrame =
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(nativeRequestAnimationFrame as any)[(Zone as any).__symbol__('OriginalDelegate')];
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if (unpatchedRequestAnimationFrame) {
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nativeRequestAnimationFrame = unpatchedRequestAnimationFrame;
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}
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const unpatchedCancelAnimationFrame =
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(nativeCancelAnimationFrame as any)[(Zone as any).__symbol__('OriginalDelegate')];
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if (unpatchedCancelAnimationFrame) {
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nativeCancelAnimationFrame = unpatchedCancelAnimationFrame;
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}
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}
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return {nativeRequestAnimationFrame, nativeCancelAnimationFrame};
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}
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